Tool for upsetting hollow rivets



July 29, 1952 A. N. VOLPE TOOL FOR UPSETTING HOLLOW RIVETS 2 SHEETS-SHEET 1 Filed April 22. 1950 'll/lla ze? i@ N a .y E @www W mmf .m Y m# 90W MM M July 29, 1952 A. N. VOLPE TOOL FOR UPSETTING HOLLOW RIVETS 2 SHEETS-SHEET 2 Filed April 22, 1950 Patented July 29, 1952 'rooL Fon UPsE'rTTNG'HoLLoW RIVETS,`

Alfred N. Volpe, Jamaica, N.jY.,: assigner to v l y Rocket Distributors, Inc., Bayside, N. Y., a corporation of New York Application A prii 22, 195o, serial N20. 157,422

- 1 u The invention disclosed in this patent isa tool for upsetting hollow rivets.

Objects of the invention are to provide a simple Y adapted to various sizes and forms of rivets.

Other desirable objects and the novel features through which the purposes of the invention are attained are set forth or will appear in the course of the 'following specication.

The drawings accompanying and. forming part of the specification illustrate certain present practical embodiments of the invention. Structure, however, may be modied and changed as regards the immediate disclosure, all within the true intent and broad scope of the invention as hereinafter dened and claimed.

Fig. 1 in the drawings is a broken and part longitudinal sectional view of a hand grip form of tool embodying the invention; .Y

Figs. 2 and 3 are cross sectional views'of the same on substantially the planes of lines 2-2 and 3 3, respectively, of Fig.`1;

Figs. 4, 5 and 6 are broken sectional and end views showing different forms of rivet expanders usable in the tool;

Figs. '7, 8 and`9 are enlarged broken longitudinal sectional views illustrating the three'phases of rst passing the collapsed expander through the rivet, Fig. 7, then pulling back the Wedge or expanding element to spread the expansible or expander element, Fig. 8, and then drawing back both these elements, Fig. 9, to effect the spreading and upsetting of the inner end of the rivet.

In Fig. 1 the tool is shown as of the gun type, having a tubular barrel I0, a pistol form of grip I I and a trigger lever I2.

The latter is shown pivoted in the body of the grip at I3 and connected by pivoted link I4 with a carriage I 5 sliding in the barrel.

The barrel is shown as open at the top and as having inturned flanges I6, Fig. 2, slidingly conning the carriage in place.

This open top character of the barrel enables the quick substitution of diierent upsetting units which can be used in the tool.

These replaceable upsetting units consist in each instance of a plunger I 1 slidingly operating in an abutment sleeve I8 confined in the back portion of the barrel and carrying a rod I9 which projects from the front end of the barrel and-is equipped with a Wedge-like piece forppening 4 Claims. (Cl. 218-19) up a surrounding expansible rivet heading meinber2I. 2 f These two elements, that is, the wedgingrexpanding member 20 and the expansible lheading member 2I, may be in various sizes and shapes to suit the work to be performed. I

Thus in Figs. 1 and 4, the. member 20 is shown as a flat sided wedge piece arranged to expand a single split surrounding sleeve member v22..

Fig. 5 shows the-wedge piece 20a as a conical element designed to expand the three-way split form of sleeve-22a. v 1 Y f .l

In Fig. 6 the wedge piece is vof conical form and the expansible sleeveV 22h is-split in four segments. Y y In all forms illustrated the expansible element has an enlarged ball shaped head 23 for flanging out and heading over the inner end of the rivet, substantially as indicated at '24 in Fig. 9.V i The split expansible sleeve 22 is shown as having a free sliding bearing at its-.outer end through the guide V25 in the end of the barrel and as having a deta'chable'screw lmounting at 25 at its inner end in the coupling sleeve 21 which is slidably guided over the forward lstem portion 28 of the wedge carrying plunger I1. A y l In similar fashion thel wedge carrying rod I9 is shown as detachably screwed at 29 into vthe stem portion 28, which is an integral extension of plunger, I1, so that diierent expandingand expansible elements 20 and 2l, respectively, may be screwed into place in the sliding sleeve and plunger members 21 and I1.

The wedge carrying plunger I1 is normally projected by a spring 30 interposed between the back of the plunger and the end of the abutment or retainer sleeve I8, said spring being'disposed about the reduced rearward stem portion 32 of the plunger which is guided through the endgof the retainer sleeve and carries a cotter pin 33 or other stop element engageable with'the end of the sleeve to limit the return stroketo the normal or rest position of the plunger and wedge piece carried thereby. I

The sleeve 21 which carries the ball shaped rivet upsetting head 23, has a limitedsliding movement over the forward stem portion 28 of plunger I1 determined by the cross pin 34 iixed in the stem portion 28 and having its projecting ends engaged in longitudinal slots 35 in opposite sides of the sleeve. c

Figs. 1 and l illustrate the normal position of parts with the plunger thrust forward by-spring 30 and the cross pin 3II carried by the plunger -at the forward end of slots 35 in sleeve 21. y

The retainer sleeve I8, with the wedge plunger I1 slidingly engaged therein,-and the expansible header sleeve 21 slidingly f engaged over the plunger, constitute a unit assembly whichA with the appropriate wedge rod I9 and split'sleeve V22 screwed thereto at 29 land .26, can be quickly and easily inserted in or removed' from the pistol grip 3 body of the tool, through the open top of the barrel.

In such placing and removal operation the wedge 20 and rivet expanding or upsetting element 2l in the fully projected, collapsed or nonexpanded condition shown in Figs. 1 and 7, will pass freely through the opening 31 in the guide 25.

In mounting it in place the unit may then be rocked downwardly to carry` the projecting ends of the cross pin 34 into seated engagement in notches 3B in the sides of the sliding carriage i5 and to engage the annularly grooved portion 39 off the yretainerl sleeve -v over anchor pins t6, Fig. 3, on opposite side walls of the pistolv grip handle.

` Removal-lof thefrivet upsetting unit'mayV-.be effected just as readily" by tipping the inner end of the unit upwardly-to-release the abutment or retainer sleeve I8 from. ^'the' holding pins '48 and to clear the cross pin --35' from thenotches 33 in the sliding carriage-1S.

'extension spring 4l is'shownconnected with v4the trigger or'grip lever l2 for the return of the grip and the operating slide tothe/forward posi- `tion shown-in-Figs. l and 7. y, '--lA screwcap 42 is'shown adjustably engaged over the end of the barrel to provide aniadjustvable'buclrorabutment" for engagement with the "head-'of the rivet. y 9 "Operation .and use Vof the tool will be clear from consideration ofY Figs.v 7, 8 and 9,' which "show first the wedge and expansible upsetting Aelerlnent in the vprojected andV collapsed condiition'passed throughl the -hollow rivetv and the 'bucking cap 42 engaged with the head of the jrivet; then the grip lever |12 is operated to retract the slide l5, and through pin 34, plunger l 1 1 will pull back the wedge 20 to spread or open upfthe split expander 2l.' In this expanding actienfa's'shown in Fig.v 8, the cross lpin 34 will lhaveetraveledto the baci; end of slots 35 to take 'up lost motion betweenfthe wedge plunger il, 28, andsurrounding expander sleeve '21; Thereafter the two elements', that is, the wedgeY piece 20 and the expander head 2l, will ltravel as one, as shown in Fig. 9, to effect and complete the spreadingk and upsetting of the inner ,end ofthe rivet.

The entry of the tapered wedge 20 into the r split expansible element 2| enlarges the diameter of therivet upsetting, ball shaped head 23 such 'thattherivet end willbedared out to accomplish i the fastening required. I

' The final impact of fully upsetting the-rivet is accomplished by both wedge and expander head having been solidly connected through engagement'. of the cross pin 34 with the inner ends of slots35.-

By screwing the buckingy cap=42 one wayor the other over-the end of the barrel, the tool 'may' be adjusted. for longer or shorter rivets or to. determine the point of location of the expander-head with respect to the innerV end of the rivet at which the head will be spread to start the rivet heading operation.

While the'cross pin 34 will thrust the split expansion sleeve outward to fully projected position-against the guide 2.5 and said sleeve will normally. restin that position while the wedge starts `its backward travel,` it is contemplated that a spring lla may be interposed between the wedge farryingfplunger Il., 28, and the rear end of the 'heading :member 2.I to yieldingly hold the sleeve 2.lf`thru'st outward in the position shown inFig. 7

` while the plunger is travelling backward to the sleeve expanding position shown in Fig. 8.

The spring 30 is stronger than spring 63 so as to hold the plunger Il projected with the cross pin 3d at the forward ends of slots 35 in the sleeve 2 'and the latter accordingly pressed against theguide 25 which therefore serves as a front stop limiting the extent of projection of both the wedge 20 and the header 2 I, as shown in Figs 1 and l'l'. Then when the plunger is retracted by the slide I5 through engagement of notches 38 with ends of cross pin 34, the weaker spring 43 will expand as shown in Fig. 8, to hold the header sleeve projected againstthe front lstop 25;.unti1 pin 34 reaches the backiendsl ofslotsfswhereuponthe plunger'and sleeveewill both be retracted as a `unitto accomplish the final upsetting action indicatedzin Fig.z9. The spring Mactstosupplementthe action of sprngrd.

Thetoolis made of hutrelatively few parts'and is strong and rugged, well adapted to thefpurposes intended :and successfully accomplishing the results herein setV forth.

With the rivet upsetting elements projecting as shown in Fig. l, a rivetmay be slipped into position thereon and the tool usedto place therivet in its seated position as'shown in Fig. 7. Then all that is required is to pull the hand lever i2 backy to the desired extent of heading over or upsetting the rivet. Asl soon as pressure on the hand lever isreleased the wedge plungerand expansion sleeve will be snapped Aforward to fullyproject these parts and collapse the sleeve so that the' tool can be `withdrawn anddisengaged from the work.

While the inventionhas 'been illustrated here embodied in the form of a hand. tool, it-*will'be realized that the mechanism may be incorporated in other forms and operated by hand or power.

What .is'clairned is:

1. A blind rivet setting tool having anV abutment for 'bucking engagement over the head of a hollow rivet, an expansiole rivet header. projecting through said abutment and arranged in collapsed condition'to pass through a hollow rivet engaged-by the abutment, a sleeve connected Awith said header, said sleeve having a longitudinal slot therein, aplunger longitudinally shiftable in said sleeve, a cross pin extending 'through said slot and into said plunger and engageable with opposite ends of said slot to provide a lostmotion connection between said sleeve and plunger, a front stop for said sleeve, a wedge piece connected with said plunger `and voperable in said header to control expansion and contraction of the header, a compression spring within said sleeve and abutting an internal shoulder thereof and the forward end of said plunger and yieldingly holding the sleeve thrust forward against said front stop, a second spring stronger than said first spring engaged with the rear end of said plunger and yieldingly projecting the wedge piece connected with said plunger beyond the bucking abutment and the cross pin on the plunger at the forward end of the slot in the sleeve, said plunger Vhaving a shoulder engageable with the sleeve toproject the header connected to the latter forwardlyof the bucking abutment under the force ofy said stronger spring, and means for retracting said plunger against the force of said stronger spring and whereby said cross pin will be carried rearwardly by said plunger into engagement with the opposite rearward end of the` slot in the sleeve -to thereby retract said sleeve and the header carried thereby after said plunger has first imparted retraotive movement to said Wedgepiece.

2. A blind rivet setting tool having an abutment for bucking engagement over the head oi a hollow rivet, an expansible rivet header projecting through said abutment and arranged in collapsed condition to pass through a hollow rivet engaged by the abutment, a sleeve connected with said header, said sleeve having a longitudinal slot therein, a plunger longitudinally shiftable in said sleeve, a cross pin extending through said slot in the .sleeve into said plunger and engageable with opposite ends of said slot to provide a lost motion connection between said sleeve and plunger, a front stop for said sleeve, a wedge piece connected with said plunger and operable in said header to control expansion and contraction of the head, a compression spring within said sleeve and abutting an internal shoulder thereof and the forward end of said plunger and yieldingly holding the sleeve thrust forward against said front stop, a second spring stronger than said first spring engaged with the rear end of said plunger and yieldingly projecting the wedge piece connected with said plunger beyond the bucking abutment and the cross pin on the plunger at the forward end of the slot in the sleeve, said plunger having a shoulder engageable with the sleeve to project the header connected to the latter forwardly of the bucking abutment under the force of said stronger spring and means for retracting said plunger against the force of said stronger spring and whereby said cross pin will be carried rearwardly by said plunger into engagement with the opposite rearward end of the slot in the sleeve to thereby retract said sleeve and the header carried thereby after said plunger has rst imparted retractive movement to said wedge piece, an abutment sleeve slidingly confining said plunger, said abutment sleeve having an end wall, the plunger having a rod extension projecting through said end wall, the second mentioned stronger spring being engaged about said rod extension between the end of the plunger and said end wall and a stop on said rod extension at the outer side of said end wall and engageable with the latter to limit the extent of projection of said plunger.

3. A blind rivet setting tool having an abutment for bucking engagement over the head of a hollow rivet, an expansible rivet header projecting through said abutment and arranged in collapsed condition to pass through a hollow rivet engaged by the abutment, a sleeve connected with said header, said sleeve havinga longitudinal slot therein, a plunger longitudinally shiftable in said sleeve, a cross pin extending through said slot in the sleeve into said plunger and engageable with opposite ends of said slot to provide a lost motion connection between said sleeve and plunger, a front stop for said sleeve, a wedge piece connected with said plunger and operable in said header to control expansion and contraction of the header, a compression spring within said sleeve and abutting an internal shoulder thereof and the forward end of said plunger` and yieldingly holding the sleeve thrust forward against said front stop, a second spring stronger than said iirst spring engaged with the rear end of said plunger and yieldingly projecting the wedge piece connected with said plunger beyond the bucking abutment and the cross pin on the plunger at the forward end of the slot in the sleeve, said plunger having a shoulder engageable with the sleeve to project the header connected to the latter forwardly of the bucking abutment under the force of said stronger spring and means for retracting said lplunger against the force of said stronger spring and whereby said cross pin will be carried rearwardly by said plunger into engagement with the opposite rearward end of the slot in the sleeve to thereby retract said sleeve andthe header carried thereby after said plunger has rst imparted retractive movement to said wedge piece, a mounting barrel supporting said bucking abutment at the forward end of the same, a carriage slidable in said barrel and having a notch to receive said cross pin, and said means for retracting the plunger including a lever connected with said slidable carriage.

4. A blind rivet setting tool having an abutment for bucking engagement over the head of a hollow rivet, an expansible rivet header projecting through said abutment and arranged in collapsed condition to pass through a hollow rivet engaged by the abutment, a sleeve connected with said header, said sleeve having a longitudinal slot therein, a plunger longitudinally shiftable in said sleeve, a cross pin extending through said slot in the sleeve into said plunger and engageable with opposite ends of said slot to provide a lost motion connection between said sleeve and plunger, a front stop for said sleeve, a wedge piece connected with saidfplunger and operable in said header to control expansion and contraetion of the header, a compression spring within said sleeve and abutting an internal shoulder thereof and the forward end of said plunger andV yieldingly holding the sleeve thrust forward against said front stop, a second spring stronger than said rst spring engaged with the rear end of said plunger and yieldingly projecting the wedge piece connected with said plunger beyond the bucking abutment and the cross pin on the plunger at the forward end of the slot in the sleeve, said plunger having a shoulder engageable with the sleeve to project the header connected to the latter forwardly of the bucking abutment under the force of said stronger spring and means for retracting said plunger against the force of said stronger spring and whereby said cross pin will be carried rearwardly by said plunger into engagement with the opposite rearward end of the slot in the sleeve to thereby retract said sleeve and the header carried thereby after said plunger has rst imparted retractive movement to said wedge piece, a mounting barrel supporting said bucking abutment at the forward end of the same, a carriage slidable in said barrel and having a notch to receive said cross pin and said means for retracting the plunger including a lever connected with said slidable carriage, an abutment sleeve slidingly conning said plunger and said second mentioned stronger spring and companion members on said abutment sleeve and barrel for removably securing said abutment sleeve in definitely positioned relation in said barrel.

ALFRED N. VOLPE.

REFERENCES CITED The following references are of record in the file of this patent: f

UNITED 'STATES PATENTS Number Name g Date 2,405,613 Shaft Aug. 13, 1946 2,430,554 Bugg et al. Nov. 11, 1947 2,480,629 Brinen Aug. 30, 1949 2,480,630 Brinen Aug. 30, 1949 2,530,855 Bugg Nov. 21, 1950 

